G90.81
BillableSerotonin syndrome
G90.81 is the ICD-10-CM code for Serotonin syndrome. It is a billable, specific code valid for reimbursement.
G00-G99 Diseases of the nervous system
Includes
- •Serotonin toxicity
Code first
- •poisoning due to drug or toxin, such as:
- •linezolid (T36.8X- with sixth character 1-4)
- •monoamine oxidase inhibitors (T43.1X with sixth character 1-4)
- •selective serotonin and norepinephrine reuptake inhibitors [SSNRI] (T43.21 with sixth character 1-4)
- •selective serotonin reuptake inhibitors [SSRI] (T43.22 with sixth character 1-4)
Use additional code
- •code for adverse effect, if applicable, to identify drug, such as:
- •linezolid (T36.8X5)
- •monoamine oxidase inhibitors (T43.1X5)
- •selective serotonin and norepinephrine reuptake inhibitors [SSNRI] (T43.215)
- •selective serotonin reuptake inhibitors [SSRI] (T43.225)
- •code, if applicable, to identify:
- •disseminated intravascular coagulation (D65)
- •hypertensive crisis (I16.-)
- •metabolic acidosis (E87.2-)
- •shock, not elsewhere classified (R57.-)
- •toxic encephalopathy (G92.-)
- •ventricular tachycardia (I47.2-)
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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